smile vs sneer

smile and sneer both are nouns.

Word	Noun	Adjective	Verb	Adverb
smile	Yes	No	Yes	No
sneer	Yes	No	Yes	No

As verbs, sneer is a hyponym of smile; that is, sneer is a word with a more specific, narrower meaning than smile:

smile: change one's facial expression by spreading the lips, often to signal pleasure
sneer: smile contemptuously

Other hyponyms of smile include dimple, grin, beam, simper, smirk.

smile (noun)	sneer (noun)
a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement	a facial expression of contempt or scorn; the upper lip curls
	a contemptuous or scornful remark

smile (verb)	sneer (verb)
change one's facial expression by spreading the lips, often to signal pleasure	smile contemptuously
express with a smile	express through a scornful smile